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This question appears to be off-topic because it is about designing a workflow program, like Lightroom, not about working with existing one, including all its limitations.
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Paul CezanneApr 4 '14 at 20:36

4 Answers
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You've combined the pick/reject model with the star rating model -- which is fine -- however that's not necessarily representative of everyone's use.

Personally, in my initial sort I almost never use pick but always use reject. Anything I don't want to keep is rejected (and deleted) so the remaining ones are, arguably, all picks. Marking all photos as pick is meaningless, of course.

I assign the pick flag based on the photos that the client (or, more likely for me, friend or family) has selected.

Ratings are completely independent of that system. A 1-star photo could be a pick. Any 5-star photo is the best or favorite, but for me it also means it's a photo I've published on my site.

The beauty of all of these meta options is that you don't need to use them in one specific way. You can combine them into a workflow that works well for you.

Personally, I use pick for images I plan to do further touch up on. They may be any rating. Flags are separate from rating and artificially limiting them serves no purpose. Those who want to use them in concert can with minimal extra effort this way, but if it followed your suggested approach, then it would be impossible for many people to operate the way they operate. The current behavior is thus more flexible and better workflow management.

I use Reject for quick selection of blurred/underexposed/etc. pictures - and delete those.

I use stars just to select good pictures. Usually I use only 4 stars for good pictures, then I just filter by 4 stars, and review those (compared to others) and give 5 stars for the really good ones, and sometimes change the 4 stars to 3 if it is not as good as some variant.

I use colors for images at different stages of postprocessing.

E.g. I have 60 good pictures (after starring them), let's say out of 3000.

Then I create variants, do Develop tricks, crop, etc. Then those I considered good get e.g. a red color. Then I filter by "red".

Then I go into more messy editing, and the results get another color, like "yellow".

And so on.

There are only a few at the end that get my final attention - but those can get 10 to 50 hours on retouching in Photoshop.

So at a glance I can select good pictures (by stars), but I can also select photos that were completed in post-processing or those that I abandoned (but my taste or free time may change, and I might revisit those).